JP2018155822A - Lens device, and imaging device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which, when a boosted voltage serves as a power source voltage of an activation circuit upon desiring to achieve a speedup in zooming, a high voltage is applied even under an activation condition conventionally not requiring the high voltage at a low speed and the like, unwanted power is consumed.SOLUTION: A lens device according to the present invention has: an optical member; an activation source that activates the optical member; command value acquisition means that acquires a command value for activating the optical member; activation signal generation means that generates an activation signal for activating the activation source on the basis of the command value; control means that sets an activation power source voltage on the basis of the command value; and power source voltage control means that converts a power source voltage to be supplied from an outside into the activation power source voltage to supply the converted activation power source voltage to the activation signal generation means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens device, and more particularly to a lens device that drives a lens driving motor at a high speed with a camera power source of a specified voltage, and an imaging device having the lens device.

  At the recording site of the program, a plurality of imaging devices are used for shooting, and the cameraman must adjust the image such as the angle of view and the focus during a short time when his / her video is not used. Lens devices used for shooting are generally in focus at the zoom telephoto end, and in order to create the image that the photographer wants, the focus is adjusted once at the telephoto end, and then the angle of view is adjusted. Action is required. That is, the photographer needs to perform this series of operations in a short time. For this reason, the photographer is required to further increase the zoom speed.

  2. Description of the Related Art Conventionally, a method for realizing high speed by setting a drive power supply voltage of a drive circuit high is known. For example, Patent Document 1 discloses a technique that enables high-speed driving of a lens by boosting the camera power supplied from the camera body and supplying the power as a servo module that drives a zoom lens and a focus lens. Yes.

JP 2003-149525 A

  However, when the boosted supply voltage is used as the power supply voltage of the drive circuit using the conventional technique disclosed in the above-mentioned patent document, a high voltage is always applied even under a driving condition that does not require a conventional high voltage such as at a low speed. It will be in the state. For this reason, there was a problem that unnecessary power was consumed.

  Accordingly, an object of the present invention is to change the power supply voltage supplied to the drive circuit in accordance with a command value for driving the optical member, thereby enabling high-speed driving of the optical member while suppressing power consumption. Is to provide a device.

  In order to achieve the above object, a lens device of the present invention includes an optical member, a drive source that drives the optical member, command value acquisition means that acquires a command value for driving the optical member, and the command Drive signal generation means for generating a drive signal for driving the drive source based on the value; control means for setting the drive power supply voltage based on the command value; and a power supply voltage supplied from the outside, the drive power supply voltage And a power supply voltage control means for supplying power to the drive signal generating means after conversion into the drive signal generation means.

  According to the present invention, by changing the drive power supply voltage supplied to the drive circuit in accordance with a command value for driving the optical member, it is possible to drive the optical member at high speed while suppressing power consumption. Can be provided.

1 is a block diagram of an imaging apparatus in Embodiment 1. FIG. FIG. 5 is a flowchart illustrating processing until a driving power supply voltage is determined in the first embodiment. FIG. 6 is a relationship diagram between a speed command value and a drive power supply voltage when a supply voltage is boosted according to a speed command value in the first embodiment. FIG. 6 is a relationship diagram between a speed command value and a drive power supply voltage when the supply voltage is stepped down according to the speed command value in the first embodiment. 6 is a block diagram of an imaging apparatus in Embodiment 2. FIG. FIG. 10 is a flowchart illustrating processing until a drive power supply voltage is determined in the second embodiment. It is a relationship diagram of an example of the speed command value and the drive power supply voltage when the supply voltage is converted according to the speed command value in the second embodiment. FIG. 10 is a block diagram of an imaging apparatus in Embodiment 3. It is a flowchart figure which shows the process until the current limiting value in Example 3 is determined. It is a related figure of an example of the speed command value at the time of converting a speed limit value according to the speed command value in Example 3, and a speed limit value.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration according to an embodiment of the present invention.

  The lens apparatus according to the first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of a lens apparatus and an imaging apparatus including the lens apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 100 denotes a lens device, and reference numeral 200 denotes a camera device including an imaging element that receives an optical image formed by the lens device 100. The lens device 100 and the camera device 200 constitute an imaging device.

The lens device 100 will be described.
The lens device 100 includes an operation member 101, a control unit 102, a DAC (digital analog converter) 103, a power supply voltage conversion unit 104, an optical member drive circuit 105, a DC motor (drive source) 106, and an optical member 107.

  The operation member 101 is connected to the control unit 102, generates a speed command value for driving the optical member in accordance with a user operation, and outputs it to the control unit 102. The operation member 101 may be configured by an operation portion configured in the lens device and a detection unit that detects an operation amount from the operation portion, or a speed command to the lens device as an external device connected to the lens device. It may be configured as a demand that outputs a value.

The control unit 102 (command value acquisition means) acquires a speed command value from the operation member 101, converts it into a control signal for generating a drive signal, and outputs it to the DAC 103. Further, it is connected to the power supply voltage conversion unit 104, and outputs the speed command value input to the control unit 102 to the power supply voltage conversion unit 104.
The DAC 103 converts the control signal input from the control unit 102 into an analog control signal and outputs the analog control signal to the optical member driving circuit 105.

  The power supply voltage conversion unit 104 is connected to the control unit 102 and converts the supply voltage supplied to the lens apparatus 100 into a voltage corresponding to the speed command value input from the control unit 102. The power supply voltage conversion unit 104 is connected to the optical member driving circuit 105, and outputs the converted voltage to the optical member driving circuit 105.

The optical member drive circuit (drive signal generation means) 105 is connected to the DAC 103 and the power supply voltage conversion unit 104, and the voltage input from the power supply voltage conversion unit 104 is used as the drive power supply voltage of the optical member drive circuit 105. In addition, the control signal input from the DAC 103 is converted into a drive signal for output to the DC motor 106.
The direct current motor 106 is connected to the optical member driving circuit 105 and the optical member 107, and drives the optical member 107 in accordance with the driving signal input from the optical member driving circuit 105.

  The power supply voltage conversion unit 104 sets the drive power supply voltage to be supplied to the optical member drive circuit 105 based on the command value from the control unit 102, converts the DC power supply voltage supplied from the outside into the drive power supply voltage, and drives the optical member Power supply voltage control means for supplying power to the circuit 105 is configured.

The details of the voltage conversion method according to the speed command value will be described later.
With the configuration as described above, the supply voltage supplied to the lens apparatus 100 can be converted by the power supply voltage conversion unit 104 in accordance with the speed command value input from the operation member 101. Further, the voltage generated by the power supply voltage conversion unit 104 instead of the supply voltage from the external device such as the camera device 200 can be used as the drive power supply voltage of the optical member drive circuit 105.
By connecting the lens apparatus 100 and the camera apparatus 200, the following processing can be performed.

  Hereinafter, with reference to the flowchart of FIG. 2, a drive power supply voltage determination process for determining the drive power supply voltage of the optical member drive circuit 105 in the first embodiment will be described. This process is performed according to a computer program stored in the lens apparatus 100.

In step S201, the power supply voltage conversion unit 104 acquires the speed command value from the operation member 101 via the control unit 102, and the process proceeds to step S202.
In step S202, the power supply voltage conversion unit 104 converts the voltage supplied from the camera device 200 into a voltage based on the speed command value, and proceeds to step S203.
In step S203, the power supply voltage conversion unit 104 sets the converted voltage to the drive power supply voltage of the optical member drive circuit 105, and the process ends.

  By performing the processing in this manner, a voltage based on the speed command value generated from the operation member 101 can be generated. Therefore, it is possible to apply a voltage necessary for driving the DC motor 106 at an intended speed to the optical member driving circuit 105 without changing the supply voltage supplied from the camera device 200.

  Therefore, in the case of a speed command value for high-speed driving, a high voltage can be used as the driving power supply voltage, and the driving power supply voltage can be set low under driving conditions that do not require a high voltage. It is possible to reduce wasteful power consumption.

Next, details of voltage conversion according to the speed command value will be described with reference to FIG.
First, when a speed command value corresponding to the minimum speed is input from the operation member 101, the supply voltage supplied from the camera device 200 is set as the drive power supply voltage of the optical member drive circuit 105 as shown in FIG. .

  Further, as the speed command value becomes higher, the DUTY ratio of a DC / DC converter (not shown) in the power supply voltage conversion unit 104 is changed in accordance with the speed command value so that the speed command value changes linearly. Thus, a boosted voltage can be generated.

  As described above, when the conventional technique is used, there is a problem that a high voltage is applied and power consumption is increased even under a driving condition that does not require a high voltage, but this time, it is low under a driving condition that does not require a high voltage. By setting the voltage, it is possible to reduce the power consumption in the range indicated by diagonal lines. That is, in at least a part of the range of the speed command value, by controlling the power supply voltage supplied to the optical member drive circuit to be higher when the speed command value becomes larger, both high speed driving and power consumption suppression are achieved. ing.

  According to the present embodiment, by changing the drive power supply voltage of the optical member drive circuit 105 in accordance with the speed command value for driving the optical member, it becomes possible to apply a voltage necessary for driving, and power consumption An image pickup apparatus that enables high-speed driving of the zoom lens while suppressing the above can be provided.

In the above embodiment, it is described that the power supply voltage conversion unit 104 boosts the voltage. However, in the case of the configuration of the optical member driving circuit 105 capable of realizing the highest speed with the supply voltage supplied from the camera device 200, FIG. As shown, the same effect can be obtained even if the supply voltage is lowered.
The same effect can be obtained even when the supply voltage is raised or lowered.

  Further, although the DC / DC converter is exemplified as the voltage conversion means of the power supply voltage conversion unit 104, the DC / DC converter is not necessarily required. Any configuration capable of voltage conversion is acceptable.

  In addition, although it has been described that the speed command value is generated by the operation member 101 configured in the lens device 100, the speed command value is not necessarily the operation member 101. In a lens system in which an external operating device is connected to the lens device 100, control based on a speed command value from the external operating device may be performed.

  In addition, although it has been described that the speed command value is generated by the operation member 101 configured in the lens apparatus 100, the speed command value is not necessarily the operation member 101. Speed information from a drive speed changing member capable of setting the drive speed may be used.

  In this embodiment, the driving of the zoom lens is described. However, the driving is not necessarily limited to the driving of the zoom lens, and the same effect can be obtained even when applied to other optical members such as the driving of the focus lens. Can do.

  In addition, when the optical member cannot move in the direction of the command value set by the user, such as when the optical member is at the end, an unnecessary voltage conversion operation is performed by invalidating the conversion function of the power supply voltage conversion unit 104. Can be prevented. In this case, only the command value is provided by including a position acquisition unit for the optical member and a determination unit for determining whether or not the command value can be driven based on the position of the optical member and the command value from the operation member. It is possible to prevent an unnecessarily high voltage from being supplied by the determination based on the above.

  In the present embodiment, the power supply voltage conversion unit 104 is disclosed as a configuration that converts the supply voltage supplied to the lens device 100 into a voltage corresponding to the speed command value input from the control unit 102. The invention is not limited to this. The power supply voltage conversion unit 104 includes a control unit (for example, the control unit 102) that sets a drive power supply voltage corresponding to a speed command value input from the control unit 102, as a supply voltage supplied to the lens apparatus 100. You may comprise so that the supply voltage supplied to the lens apparatus 100 may be converted into the drive power supply voltage set by this control means.

The imaging apparatus according to the second embodiment of the present invention will be described below with reference to FIGS. The same functional components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
FIG. 5 is a block diagram of the imaging apparatus in the present embodiment. The difference is that a command value comparison unit 108 is added to the lens apparatus of Example 1 shown in FIG.

  The control unit 102 acquires a speed command value from the operation member 101, converts it into a control signal for generating a drive signal, and outputs it to the DAC 103. Further, it is connected to the command value comparison unit 108 and outputs the speed command value input to the control unit 102 to the command value comparison unit 108.

  The command value comparison unit (comparison means) 108 compares the threshold value set in the command value comparison unit 108 with the speed command value input from the control unit 102. Further, it is connected to the power supply voltage conversion unit 104, and outputs comparison information between the acquired speed command value and the threshold value to the power supply voltage conversion unit 104.

  The power supply voltage conversion unit 104 sets voltage conversion information based on the comparison information input from the command value comparison unit 108. Further, in consideration of the set voltage conversion information, the supply voltage supplied to the lens apparatus 100 is converted into a voltage based on the speed command value. Further, it is connected to the optical member driving circuit 105 and outputs the converted voltage to the optical member driving circuit 105.

With the configuration as described above, by setting voltage conversion information for converting the voltage based on the speed command value input from the operation member 101, the supply voltage supplied to the lens device 100 is converted according to the speed command value. It becomes possible to do.
Details of the voltage conversion method will be described later.

  Hereinafter, with reference to the flowchart of FIG. 6, the drive power supply voltage determination process for determining the drive power supply voltage of the optical member drive circuit 105 in the second embodiment will be described. This process is performed according to a computer program stored in the lens apparatus 100.

In step S601, the command value comparison unit 108 acquires the speed command value from the operation member 101 via the control unit 102, and the process proceeds to step S602.
In step S602, the command value comparison unit 108 compares the threshold value set in the command value comparison unit 108 with the speed command value. If the speed command value is greater than or equal to the threshold value, the process proceeds to step S603, and if the speed command value is less than the threshold value, the process proceeds to step S604.
In step S603, the power supply voltage conversion unit 104 sets the voltage conversion information, which is one reference information when converting the voltage, to the first voltage conversion information (steps up), and proceeds to step S605.
In step S604, the power supply voltage conversion unit 104 sets the voltage conversion information, which is one reference information when converting the voltage, to second voltage conversion information (not boosted) different from the first voltage conversion information. The process proceeds to S605.
In step S605, the power supply voltage conversion unit 104 converts the supply voltage supplied from the camera device 200 into a voltage based on the speed command value in consideration of the set voltage conversion information, and the process proceeds to step S606.
In step S606, the power supply voltage conversion unit 104 sets the converted voltage to the drive power supply voltage of the optical member drive circuit 105, and the process ends.

  By performing the processing in this way, the voltage can be generated nonlinearly with respect to the speed command value generated from the operation member 101. Therefore, it is possible to apply a voltage to the optical member driving circuit 105 as much as necessary to drive the DC motor 106 at an intended speed without changing the supply voltage supplied from the camera device 200. Become.

Next, details of voltage conversion in accordance with the speed command value will be described with reference to FIG.
As an example, as shown in FIG. 7, a speed command value less than the threshold set in the command value comparison unit 108 is converted to a conventional speed command value that can be driven by the supply voltage from the camera device 200, and a speed command value greater than or equal to the threshold. The speed command value in the high speed range where high speed driving is required.

  In the case of a conventional speed command value, it is not necessary to boost the voltage in the first place. Therefore, when the speed command value is less than the threshold value set in the command value comparison unit 108, the voltage conversion information is set to the second voltage conversion information (not boosted), whereby the supply voltage from the camera device 200 is set. Can be set as the drive power supply voltage of the optical member drive circuit 105.

  In the case of the speed command value in the high speed region, it is necessary to increase the pressure higher as the command value becomes a threshold value. Therefore, by setting the voltage conversion information to the first voltage conversion information (boosting), the DUTY ratio of the DC / DC converter (not shown) in the power supply voltage conversion unit 104 is changed according to the speed command value, and the speed command It is possible to generate a boosted voltage based on the value.

  As described above, when the conventional technique is used, there is a problem that a high voltage is applied and power consumption is increased even under a driving condition that does not require a high voltage, but this time, the voltage is boosted only under a condition that requires a high voltage. Therefore, an increase in power consumption can be suppressed.

  According to the present embodiment, by changing the drive power supply voltage of the optical member drive circuit 105 in accordance with the speed command value for driving the optical member, it becomes possible to apply a voltage necessary for driving, and power consumption It is possible to provide an imaging apparatus capable of increasing the zoom speed while suppressing the above-described problem.

In the above embodiment, it is described that the power supply voltage conversion unit 104 boosts the voltage. However, in the case of the configuration of the optical member driving circuit 105 capable of realizing the highest speed with the supply voltage supplied from the camera device 200, FIG. As shown in FIG. 5, the same effect can be obtained even when the supply voltage is lowered.
The same effect can be obtained even when the supply voltage is raised or lowered.

  Further, although the voltage conversion information is “presence / absence of boosting”, this is not necessarily required. By setting the voltage conversion information as the “boost ratio”, when 0%, the same effect as “no boost” can be obtained, and when it is 1% or more, the desired transformation ratio can be realized.

In addition, although the setting threshold value is described as one place, it is not always necessary to be one place. By setting a plurality of locations, it is possible to generate a drive voltage with a plurality of transformation ratios according to the command value, and it is possible to realize a more desired applied voltage.
Further, in the present embodiment, the case where the command value comparison unit 108 is provided separately from the control unit 102 is illustrated, but the present invention is not limited to this, and the control unit 102 can control the command value of the present embodiment. You may comprise so that it may have the function of the comparison part 108 together.

The lens apparatus according to the third embodiment of the present invention will be described below with reference to FIGS. The same functional configurations as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.
FIG. 8 is a block diagram of an imaging apparatus including the lens apparatus in the present embodiment. FIG. 5 used in the second embodiment is different in that a current limiting circuit 109 is added.

  The command value comparison unit 108 compares the threshold value set in the command value comparison unit 108 with the speed command value input from the control unit 102. The command value comparison unit 108 is connected to the power supply voltage conversion unit 104 and the current limiting circuit 109, and outputs the acquired comparison information between the speed command value and the threshold value to the power supply voltage conversion unit 104 and the current limiting circuit 109.

A current limiting circuit (current limiting means) 109 is connected to the command value comparing unit 108 and sets a current limiting value for driving the DC motor 106 based on the input comparison information. The current limiting circuit 109 is connected to the optical member driving circuit 105 and outputs a driving signal input from the optical member driving circuit 105 to the DC motor 106. That is, in this embodiment, the drive signal output from the optical member drive circuit 105 is not directly input to the DC motor 106 but is input to the DC motor 106 via the current limiting circuit 109.
The DC motor 106 is driven according to the drive signal input from the current limiting circuit 109.

  Hereinafter, a current limit value determination process for determining the current limit value of the current limit circuit 109 in the third embodiment will be described with reference to the flowchart of FIG. This process is performed according to a computer program stored in the lens apparatus 100.

In step S901, the command value comparison unit 108 acquires the speed command value from the operation member 101 via the control unit 102, and the process proceeds to step S902.
In step S902, the command value comparison unit 108 compares the threshold value set in the command value comparison unit 108 with the speed command value. If the speed command value is greater than or equal to the threshold, the process proceeds to step S903, and if the speed command value is less than the threshold, the process proceeds to step S904.
In step S903, the current limiting circuit 109 sets the current limiting value at the time of driving low, and the process ends.
In step S904, the current limiting circuit 109 sets a current limiting value at the time of driving high, and the process ends.

  By performing the processing in this way, the current limit value at the time of driving can be determined based on the speed command value generated from the operation member 101. Therefore, as shown in FIG. 10, in the case of high speed driving where the torque of the DC motor 106 is small, the current limit value can be set low, so that the maximum power consumption can be suppressed. As a result, power consumption can be suppressed so as not to exceed the maximum supply power of the camera device, so that compatibility with the camera device can be maintained.

According to the present embodiment, the maximum power consumption can be suppressed by changing the current limit value of the current limit circuit 109 according to the speed command value for driving the optical member, and the compatibility with the camera is conscious. Thus, it is possible to provide an imaging apparatus capable of increasing the zoom speed.
In the above embodiment, the current limit value is “high / low”, but it is not always necessary. The same effect can be obtained if the information represents different current limit values.

  Moreover, although the case where one setting threshold value was used was demonstrated, it does not necessarily need to limit to the use of only one setting threshold value. By using a plurality of setting thresholds, the current limit value can be set numerically for each range, and more efficient power reduction can be realized.

DESCRIPTION OF SYMBOLS 100 Lens apparatus 101 Operation member 102 Control part (command value acquisition means, control means)
104 Power supply voltage converter (power supply voltage control means)
105 Optical member drive circuit (drive signal generating means)
106 DC motor (drive source)
107 Optical member

Claims (15)

An optical member;
A drive source for driving the optical member;
Command value acquisition means for acquiring a command value for driving the optical member;
Drive signal generating means for generating a drive signal for driving the drive source based on the command value;
Control means for setting a drive power supply voltage based on the command value;
Power supply voltage control means for converting a power supply voltage supplied from the outside into the drive power supply voltage and supplying power to the drive signal generating means;
A lens device comprising:   2. The lens device according to claim 1, wherein the control unit sets the drive power supply voltage to be higher as the command value increases in at least a part of the range of the command value. Comparing means for comparing the command value with a preset threshold value,
The control means controls the drive power supply voltage set when the command value is equal to or greater than the threshold to be higher than the drive power supply voltage set when the command value is less than the threshold.
The lens apparatus according to claim 1 or 2, wherein Current limiting means for setting a current limit value of the drive source based on the command value;
The drive signal generated by the drive circuit is output to the drive source via the current limiting means.
The lens device according to claim 1, wherein the lens device is a lens device.   The current limiting means is set to make the current limit value set when the command value is equal to or greater than the threshold value smaller than the current limit value set when the command value is less than the threshold value; The lens device according to claim 4. Position acquisition means for acquiring the position of the optical member;
Determination means for determining whether or not the position of the optical member acquired by the position acquisition means can be driven by the command value;
Have
If it is determined by the determination means that the movement by the command value is impossible, the control means sets the power supply voltage supplied from the outside to the drive power supply voltage.
The lens device according to claim 1, wherein the lens device is a lens device.   The lens apparatus according to claim 1, wherein the command value is a speed command value.   The lens apparatus according to claim 1, wherein the optical member is a zoom lens or a focus lens.   9. The lens apparatus according to claim 1, wherein the power supply voltage control unit obtains the drive power supply voltage by boosting the power supply voltage supplied from the outside.   The lens apparatus according to claim 1, wherein the power supply voltage control unit obtains the drive power supply voltage by stepping down the power supply voltage supplied from outside.   The lens apparatus according to claim 1, wherein the power supply voltage control unit obtains the drive power supply voltage by stepping up and down the power supply voltage supplied from the outside. An operation member for operating the driving of the optical member;
The command value acquisition means acquires a command value based on an operation amount from the operation member;
The lens device according to claim 1, wherein the lens device is a lens device.   The lens apparatus according to claim 1, wherein the driving source is a DC motor. A lens device according to any one of claims 1 to 13, and an operation device that is connected to the lens device and outputs a command value for driving the optical member to the lens device.
The command value acquisition means acquires the command value from the operating device.
A lens system characterized by that.   An image pickup apparatus comprising: the lens apparatus according to claim 1; and an image pickup element that receives an optical image formed by the lens apparatus.

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